John mcmurtky



@with -tstrs @anni @fitta JQHN MCMURTRY, oF LEXINGTON, KENTUCKY.

. Letters Patent No. 74,927, dated February 2 5, 1868.

Inrnovsnsin.' INSTARTING sans.

To ALL WHOM'IT MAY eoNeERN:

Be it known that I, JOHN McMUl'tTRY, of Lexington, inthe State o t Kentucky, have invented certainI new and useful Improvements in Methods for Starting Gars; and I hereby declare that-the following is a true, full,

. and exact description ofthe same, reference being had to the accompanyingdrai'vings, and to the letters of 1-ei`er.

ence marked thereon.' In the drawings annexed, which make a. part ot' this specification-.Q

Figurel represents'a side elevation of a car, with al part' of the bottom removed, so as to yeizhibit'my improvement.

Figure2 is a plan view ot' the car and works attache-d when invertel.

Figure 3 is a side view of brake y and rubber spring.` I

The letter A represents a. spiral spring, e, thatmay be placed undertheseat of the car, in the box Z. A strong piece o f timber, marked o, is extended from one end of the ear to the other The beame: is ilush with the bottom of the car, and has the toothed rackt screwed to the bottom ot' it. Into the outer edge of beam c the slotsd areI cut, theuobjeet ot'lwhich will be' hereinafter explained. ff designate the two friction-wheels attached to the common brake, g g. The wheelsff operate on the sameaxles that operate the friction-wheels on the opposite side of thecar, H H representcog-wheels, keyed on the main axles, LL, Vinside of the driving-wheels I I. Resting against the inner surface of wheels H H are the disks J J,which ft looselylon the axles L. The i .said disks are furnished with pins or cogs s, whichwork in'slots d d. q' is a doubleffaced rpawl', pivoted to disk on its inner side, the. said pawl being intended to "operate on the cogs in wheels H H, in both directions alterlnately. On the shafts of wheels ff are placed thepinionsn n, which are intended to work in. the 'toothed rack b. RR designate the' common brakeranka'fot acting en brukes Y i The object of myfimprovemen't is to relieve the dead-point on the starting of the car, and the operatonof` the devices. above described .is as follows: In stopping of the cars, by the action ofthe brakes g y, the wheels ff come in contact with the periphery of wheels I I, in advance of ,the bralces gg, but by means'of an Indiarubber spring, as shown, on he back of the shaft of the wheels ff, (see letter m, fig'. 3,) the said shaft will yield, so as to Vlet the brakes g g press againstV the wheels I I, but' `the' friction-wheels ff will lcontinue to turn until the car stops, and in turningA operate the beam c bythe action of cog-wheels H on rack-bar b. The movement of beam will bring the pins-tin contact with spiral spring e, and force it back.; This action will bring the pawl q on the top of the xed cog-wheel H. When it is desired to start the car, it is only necessari-)1 to 'let go the brake-handle R, when the spring c will force back the beam c, whose slots d, working on the pins s of the loose wheels j, will cause the'pawls q to move forward the ear instantly. My improvement will operat alike from either end of the'cai'.

Having thus described myinvention, what I claim, and desire to secure by Letters Patent, is-' set forth.

2. Ilhe disk J, provided with pins s s, i'n combination with'beam c, substantially as described. l 13. The spring e, in combination with pins t and beam e, operating substantially as specified.

1. The beam c, when' provided with slots d d, and rack b, operating substantially as and for the-purpose 4. The cogwheel H and'double-aeting pawl q, in oombinationwith disk J, arranged substantially as and for the purpose described.

' 5. The friction-wheelff, and pinions un, in combination with beam c, operating substantially as set forth. 6. The brake gfprovidedwith a slot and spring, m, in combination with-friction wheolsff and pinionsnl n,

as and for the purpose specified. h :l

In testimony that I acknowledge the foregoing as my own act, I hereby affix mysignature vin the presence Vof" two witnesses.

' JOHN .Mc-MURTRY.

Witnesses:

GEO. C."`McMUnTRY, Ap. I. isessiss; 

